Context initialization mixes base context init with sub context init.
This is bad because contexts can be reused, and on reuse, reinit things
that should not re-initialized.

Normalize comments and function names to refer to base context and
sub context (not main, shared or slaves).

Separate the base context initialization from sub context initialization.

hfi1_init_ctxt() cannot return an error so changed to a void and remove
error message.
Reviewed-by: NMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NMichael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>